Parenchyma, collenchyma, and sclerenchyma are classified as:
a. dermal tissues.
b. vascular tissues.
c. ground tissues.
d. primary tissues.
e. secondary tissues.
C
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Endorphins
a. are natural painkillers. b. are released during orgasm c. influence the effects of neurotransmitters d. are released during exercise or laughter. e. include all of these descriptions.
Which of the following is correct about cDNA?
A. It is normally found in the nucleus of eukaryotic cells. B. Reverse transcriptase is used on the primary transcript. C. It represents the gene without the introns. D. It is found in the nucleoid of bacteria.
?A Barr body is a(n) ____.
a. activated X chromosome
b. inactivated X chromosome
c. immature trophoblast
d. immature blastocyst
e. mature blastocyst
Globular proteins fold up into compact, spherical structures that have uneven surfaces. They tend to form multisubunit complexes, which also have a rounded shape
Fibrous proteins, in contrast, span relatively large distances within the cell and in the extracellular space. Which of the proteins below is not classified as a fibrous protein? (a) elastase (b) collagen (c) keratin (d) elastin