About how often have catastrophic destructions of the magnitude of the end-Cretaceous bolide impact occurred?
A) at intervals of a billion years
B) at intervals of 10 to 100 million years
C) at intervals of 10 to 100 thousand years
D) only once
Ans: B) at intervals of 10 to 100 million years
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A mutated gene that transforms a normal cell into a tumor cell is called a
a. proto-oncogene. b. oncogene. c. neoplasm. d. checkpoint gene. e. carcinoma.
The base of the food web in the deep sea is:
a. phytoplankton. b. algae. c. seagrasses. d. sinking dead matter. e. viruses.
There are three alleles controlling the ABO blood
types. IA and IB are codominant genes so that the combination IAIB produces the AB blood type. The third allele, IO, is recessive to the other two alleles. Indicate which of these parents could produce the given child:Parents Child Yes or No (a) A x AB B (b) A x O A (c) A x B O (d) A x AB O (e) A x AB B (f) B x B O (g) AB x AB A What will be an ideal response?
Where are sperm produced?
a. in the seminiferous tubules b. in the prostate gland c. in the penis d. in the epididymis