Reference no: EM132469101

Assignment - Biology Questions

QUESTION 1 - Suppose that a plant ordinarily is very effective at blocking herbivores due to production of a compound called defensin. Researchers use gene silencing to narrow down the gene that produces the compound from a list of candidates. The graph below shows the amount of herbivore damage resulting from the silencing of four different genes (A, B, C, and D), as well as the amount in the control. Based on these graphs, which gene is most likely responsible for producing defensin?

A.Gene A

B. Gene B

C. Gene C

D. Gene D

E. None of the above

QUESTION 2 - Small single-stranded RNA molecules called microRNAs (miRNAs) are capable of base pairing with specific binding sites in the 3′ untranslated region of many mRNA transcripts. Transcription of gene Q yields an mRNA transcript that contains such an miRNA binding site, which can associate with miRNA-delta, a specific miRNA molecule.

Which of the following best supports the claim that binding of miRNA-delta to the miRNA binding site inhibits translation of gene Q mRNA?

A.When the promoter for gene Q is altered, transcription is inhibited.

B.Translation of Q mRNA is inhibited regardless of whether the miRNA binding site sequence is altered.

C.Translation of Q mRNA is inhibited in the absence of miRNA-delta.

D.When the miRNA binding site sequence is altered, translation of Q mRNA occurs in the presence of miRNA-delta.

QUESTION 3 - Why is the milk heated to 160 degree F to make yogurt?

QUESTION 4 - a)Name the cell and protein fibers the cell produces that are involved in the joining the ends of fractured bone.

b) When mild amount of stress ( such as jogging) is applied to bone tissue overtime

1) the bone becomes thinner

2) the bone compensates by becoming thinner in the region of the stress

3) the monerals in the bone produce weak electrical field that stimulates osteoblasts

4) osteoclast activity increases to make the bones stronger.

QUESTION 5 - 1. List the two domains that contain prokaryotic cells.

2. List two beneficial uses of bacteria.

3. List two human diseases caused by bacteria.

4. What is the purpose of fixing the smear?

5. Describe the two methods of fixing a smear.

6. Describe an advantage of viewing an unstained specimen.

7. List three stains that are used in simple staining procedures.