The enzyme packet on the head of a sperm that allows penetration into the egg is called the
a) centriole
b) centromere
c) acrosome
d) prothallus
e) penile penetrating enzyme
Answer: c) acrosome
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Which of the following cells conduct sugars?
a. tracheids b. vessel members c. companion cells d. sieve-tube members e. more than of these cells conduct sugars
Could a varying, self-replicating population of RNA molecules be considered alive?
A) No, because such a population would not be contained inside a cell. B) Yes, because such a population would show variation, inheritance, and selection. C) No, because RNA molecules are not subject to selection. D) Yes, because RNAs code for proteins that can then replicate the RNAs. E) No, because ribonucleotides are not suited for energy transfer functions.
Mendel's postulate of independent assortment is supported by a 1:1:1:1 testcross ratio
Indicate whether the statement is true or false
In humans, depth perception is possible because
A) the two eyes see identical images. B) we have two eyes on the sides of our heads. C) the two eyes have overlapping visual fields. D) each of the two eyes "sees" an entirely different image. E) the two eyes are necessary for any vision to occur.