Which chemical is responsible for breaking down ozone in the atmosphere?
A) CO2
B) CH3
C) CFC
D) CO4
C
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Every protein is assembled on a(n) ____ according to instructions copied from ____, using ____ as an intermediate
a. mRNA; tRNA; DNA b. tRNA; mRNA; DNA c. ribosome; mRNA; tRNA d. tRNA; DNA; mRNA e. ribosome; DNA; mRNA
The step of DNA replication in which the replication proteins open up the double helix and prepare for complementary base pairing is called
A) initiation. B) elongation. C) termination. D) translation. E) translocation.
Which of the following organs of the endocrine system secretes cortisol and aldosterone?
a. pituitary gland b. pancreas c. pineal gland d. adrenal glands e. thyroid gland
Which structures are characterized by its smallest branches ending with a large flame cell?
a. hepatic tubules b. nephrons c. Malpighian tubules d. protonephridia