The fossil record is usually derived from sedimentary rocks laid down millions of years ago.
a. true
b. false
Ans: a. true
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Respond to statements 115–119 in reference to the five
endocrine glands listed below. a. pituitary b. adrenal c. pancreas d. thyroid e. thymus M 115. This gland is the target for corticotropin (ACTH). E 116. Oxytocin is released from this gland. M 117. Antidiuretic hormone is released from this gland. M 118. This gland produces a hormone that directly controls development and helps control metabolic rate. E 119. Insulin is produced in this gland.
Dictyostelium discoideum is an unusual organism, one that straddles the boundary between the unicellular and the multicellular. Its feeding phase consists of individual amoeba-like cells that move independently, feeding on bacteria by phagocytosis. When the food runs out, cells begin to aggregate into a multicelled structure that migrates toward light. The cells differentiate into a base, stalk, and spores; only the spores survive to colonize a new habitat. Dictyostelium discoideum is which of the following?
a. A protozoa b. An apicomplexan c. An algae d. A diatom e. A slime mold
Which operons are never transcribed unless activated?
a. Inducible operons b. Repressible operons c. Inducible and repressible operons
Carbon has 4 electrons and hydrogen has 1 electron in its outermost electron shell. A carbon atom can form covalent bonds with how many hydrogen atoms?
A. 1 B. 2 C. 0 D. 3 E. 4