BIOLOGY HIGH SCHOOL

A certain species of animal represents just 3 percent of the biomass in its ecosystem. we might classify this as a keystone species if its elimination

Answers

Answer 1
Answer: Keystone species are those species on which organisms living in that ecosystem largely depend upon. Elimination of keystone species can lead to adverse effects on the organisms living there and the diversity of that community gets decreased. Thus. a keystone species play an important role in maintaining the stability in the ecosystem. 

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MIDDLE SCHOOL

Many bacteria are able to pass small pieces of the hereditary information on their DNA from one bacterial cell to another. This can sometimes result in an increase in the number of drug-resistant bacteria. What name is given to the process by which one bacteria transfers DNA to another

Answers

Answer:

The correct answer is: conjugation.

Explanation:

Bacteria are organisms capable of exchanging information with other individuals of their species, and they can do so through many mechanisms.

Conjugation is one of the ways in which bacteria can exchange information.

Conjugation refers to the transfer of DNA thanks to the direct contact between two bacteria and is mediated by plasmids (DNA molecules that are not chromosomal and locate in the bacterium's cytoplasm).

The conjugative plasmid resides in the donor cell. This donor cell produces a sex pilus that attaches to the recipient cell and thus they communicate to transmit the DNA from the donor to the recipient.

This process has clinical relevance since conjugation may increase the number of drug-resistant bacteria.

The answer is B) conjugation, definitions can help solve some.
HIGH SCHOOL

How does the eukaryotic initiation complex locate the correct start codon? A) The true start codon is the first ATG encountered downstream of the Shine-Dalgarno sequence.
B) The initiation complex moves the small ribosomal subunit through the 5ʹ UTR, scanning for the start AUG.
C) The pre-initiation complex moves the ribosome through the 3ʹ UTR, scanning for the Kozak sequence.
D) The correct start codon is the first ATG encountered downstream of the Kozak sequence.
E) The correct start codon is the formyl-ATG, which will encode for fMet in the protein.

Answers

Answer:

The correct answer will be option-C

Explanation:

The eukaryotic translation takes place in three steps that are initiation, elongation and termination.

During the initiation process, the amino-acyl tRNA carrying the methionine amino acid binds the small ribosomal subunit. This pre-initiation complex of small subunit and tRNA now gets attached to 5ʹ UTR and starts scanning mRNA to find start codon -AUG.

The pre-initiation complex when finds the start codon attaches the large subunit of ribosome and form initiation complex. The formation of the initiation complex begins the process of translation.

Thus, Option-C is the correct answer.

HIGH SCHOOL

Which two major factors are typically used to classify climates?

Answers

Temperature and precipitation.

Answer:

Precipitation, Temperature, and vegatation.

Explanation:

MIDDLE SCHOOL

What are the 4 things that make plants unique to their algae ancestors?

Answers

The four ways by which land plants later evolved and became unique from their algal ancestors are:

Explanation:

The ancestors or close relatives of land plants are the green algae also called the charophytes.  Land plants became unique from their algal ancestors due to evolutionary changes required for adaption with the environment.

  1. Alteration in the successive generations of plant species, produces gametes and sporophytes through mitosis and meiosis.
  2. Embryonic growth at multicellular level, obtains nutrient from parent cells.
  3. Plants produces spores through sporangia  and have multicellular gametangia
  4. Growth of plant occurs through apical meristems by differentiation of tissues

Four things that make plants unique to their algae ancestors are:

1. Plants have connective tissues that helps to transport nutrients and water throughout the plant. While in algae, each cell absorbs its own water. This makes algae non vascular.

2. Plants are multi-cellular that consists of chloroplasts, cellulose walls and also have the ability to make embryos while algae are generally single celled.

3. Algae majorly thrives in water that uses the minerals found in water to produce their own food but some can live on land and even on snow. However,  Plants mostly grow on land because they use sunlight and CO2 to keep some of its most important biologic processes going on.

4. The mode of reproduction in plants is more complex compared to that of algae which is primitive.

HIGH SCHOOL

If your skin swells up from a splinter, or puss forms in a cut, your _____ system is working to treat the area. A. circulatory B. excretory C. immune D. digestive

Answers

If the skin swells up from a splinter, or puss forms in a cut,the immune system is working to treat the area.The immune system is the part of the body which is responsible in releasing antibodies once the body suffers from any strange body conditions. 

Answer:

c. immune

Explanation:

HIGH SCHOOL

You are a forensic scientist. For today, your supervisor tells you to perform a confirmatory test for semen on Item D. You recover Item D from the evidence locker. Item D is a vaginal swab from a sexual assault kit. An AP Spot Test has already been performed on the swab, with a positive result. You cut off a small portion of the swab. You agitate the swab in a small tube with water. You smear this water onto a microscope slide and stain the slide with red dye and green dye. You look for sperm cells under a microscope, but do not observe any sperm cells. Explain.

Answers

Answer:

Ok

Explanation:

MIDDLE SCHOOL

Explain the importance that Agriculture has on your everyday life. Describe how your life would be affected on a day to day basis without Agriculture

Answers

Without agriculture my life would be different as I would not have acsess to all these fresh fruot and vegetables we have today. Our diets would have to adapt to more unnatural food, and our bodies would not be as healthy as they are now.

HIGH SCHOOL

What type of membrane transport is used in the following scenario? A) Neurons will release signaling molecules called neurotransmitters in order to communicate with other neurons or with organs.
B) In the axon terminal of many neurons are storage vesicles of these neurotransmitters called synaptic vesicles.
C) When an electrical signal known as an action potential is propagated to the axon terminal, the synaptic vesicles fuse with the neuronal membrane and the neurotransmitter is released.

Answers

Answer:

Exocytosis

Explanation:

Exocytosis is a form of bulk transport, in which molecules are moved from the inside of the cell to the extracellular space. It is defined as the fusion of vesicles that form inside the cell, with the plasma membrane, resulting in the release of the vesicle's content.

HIGH SCHOOL

Heat will flow from warm to cold a. until both objects reach the same temperature.
b. until no particles move.
c. until all objects are hot.

Answers

answer:

until both objects reach the same temperature.

explanation:

When you take two things of different temperature in contact with each other, energy will always be transferred from the hotter object to the cooler object. The objects will transfer thermal energy until the thermal balance is reached, i.e.the temperature of both of the bodies become equal


A. until both objects reach the same temperature
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