In which animals is external fertilization most common?
a. in animals living on mountains
b. in animals living in oceans
c. in animals living in forests
d. in animals living on prairies
Answer: b. in animals living in oceans
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Bacterial proteins were radioactively labeled and fed to phagocytic cells. The proteins within the phagocytic cell became increasingly more radioactive over time. This observation is the result of the activity of
A) mitochondria. B) chloroplasts. C) lysosomes. D) peroxisomes. E) the Golgi apparatus.
In pre-mRNA processing, ____
a. exons are spliced out and used to produce ribosomal subunits b. introns are spliced out and combined to form complete proteins c. introns are spliced out and combined in the tRNA d. exons are spliced out and the introns are combined in the mature mRNA e. introns are spliced out and the exons are combined in the mature mRNA
Some invertebrates do not have special respiratory organs and rely on __________ exchange, which involves the
diffusion of gases across the body surface. Fill in the blank(s) with the appropriate word(s).
What term describes distribution patterns of living things around the world?
What will be an ideal response?