Author Question: During a discussion on cellular components and their function, a student asked the instructor the ... (Read 48 times)

jilianpiloj · **on:** Jun 25, 2018

During a discussion on cellular components and their function, a student asked the instructor the purpose of messenger RNA (mRNA). Of the following, which is the most accurate answer?

A)
Transports amino acids to the site of protein synthesis
B)
Acts as an inner nuclear support membrane for a rigid network of protein filaments that bind DNA to the nucleus
C)
Performs an active role of protein synthesis, where mRNA molecules direct the assembly of proteins on ribosomes to the cytoplasm
D)
Assists cells in forming neoplastic progression by altering the response of chromatin in the nuclear matrix

Question 2

A community health nurse is working with an 81-year-old female client who states that she has made a concerted effort throughout her life to protect her skin from the sun and regularly applies topical moisturizers.

The client is lamenting the fact that her skin's appearance has nonetheless deteriorated in recent years. Which of the following statements best captures a fact that the nurse should take into consideration when crafting a response to the client?
A)
The epidermal layer of the skin inevitably thins as part of the normal aging process, lending a transparent appearance to the skin.
B)
Skin becomes weaker and less elastic in older adults because of the rearrangement of fibrin and keratin.
C)
Skin becomes more fragile and prone to hematomas because of impaired vascularity.
D)
Output of sebaceous glands declines, with accompanying reductions in sweat production.

mbcrismon · **Reply #1 on:** Jun 25, 2018

Answer to Question 1

Ans:
C

Feedback:

The nucleus is the site for the synthesis of three types of RNA that move to the cytoplasm and carry out the actual synthesis of proteins. Messenger RNA copies and carries the DNA instructions for protein synthesis to the cytoplasm. Ribosomal RNA is the site of actual protein synthesis; transfer RNA transports amino acids to the site of protein synthesis.

Answer to Question 2

Ans:
C

Feedback:

Impaired vascularity and cellularity cause the skin of older adults to be prone to subcutaneous bleeding, resulting in senile purpura. The dermal, rather than epidermal, layer becomes thinner, and weakness is a result of collagen rearrangement rather than fibrin. Sebaceous glands produce sebum not sweat.