Which of the following is not directly involved in translation?
A. rRNA
B. mRNA
C. DNA
D. tRNA
E. Ribosomes
Answer: C
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In the photomicrograph of a portion of thick skin shown below, which layer is only seen in thick skin?
a) A b) B c) C d) D e) E
The submucosa of the duodenum contains ________ that produce copious amounts of mucus.
What will be an ideal response?
Normally, an adult at rest should have respirations that:
A) are 20 to 24 breaths/min with adequate chest rise. B) follow a regular pattern of inhalation and exhalation. C) have a slightly reduced tidal volume and normal rate. D) are adequate to sustain a heart rate of 80 beats/min.
Why would evidence of sense organs in the head of a fossil animal (such as Haikouella) suggest a close relationship with vertebrates that is, which critical vertebrate feature would have to be present?
What will be an ideal response?