David has just been told by his doctor that he has a malignant growth. Which of the following
is true?
a. He has a noncancerous tumor.
b. The tumor cells are spreading through his body.
c. He has a single mutation in one of his oncogenes.
d. both (b) and (c)
B
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Spontaneous mutations that occur in somatic cells will be transmitted to offspring
A. true B. false
Parthenogenesis is:
A. reproduction by way of diploid females laying diploid eggs that hatch into diploid females B. asexual reproduction by way of budding of a new individual from the parent C. reproduction by way of diploid females laying haploid eggs that require fertilization by sperm D. reproduction by way of haploid females laying haploid eggs that hatch into haploid females E. reproduction by way of diploid females laying haploid eggs that hatch into haploid males who in turn produce sperm that fertilizes other haploid eggs
When pollen from one species lands on the stigma of a flower from another species, the pollen tube typically ____
a. does not develop b. forms, but the sperm cannot penetrate the egg c. forms and grows to the ovary, but then stops d. forms, but the sperm are killed e. forms and the egg is usually fertilized, but the embryo rarely grows
Molecules that are involved in the regulation of gene expression, which are usually comprised of proteins?
(A) translation factors (B) RNA polymerase (C) RNA codons (D) transcription factors