Many, though not all, mollusks have a shell. What secretes the shell?
A. The visceral mass
B. The radula
C. The mantle
D. The foot
Answer: C
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In eukaryotes, the DNA molecule that comprises a chromosome is ____ and has ____ replication origin
a. circular, one b. circular, more than one c. linear, more than one d. linear, one e. linear, no
You collect and measure samples of ice and surrounding ice water from a stream in the winter. You find that you collected the same number of water molecules in each form. The volume of the ice samples are larger than the ice water samples. This is a result of
A. the ionic bonds between the water molecules being unstable and constantly forming and breaking that increases the volume and decreases the density of the ice. B. the covalent bonds between the water molecules being unstable and constantly forming and breaking that increases the volume and decreases the density of the ice. C. the covalent bonds between the water molecules being in a fixed position that increases the volume and decreases the density of the ice. D. the hydrogen bonds between the water molecules being unstable and constantly forming and breaking that increases the volume and decreases the density of the ice. E. the hydrogen bonds between the water molecules being in a fixed position that increases the volume and decreases the density of the ice.
Which of the following is an extraembryonic
tissue that burrows into and thus attaches to maternal tissues?
a. the amnion b. the yolk sac c. the chorion d. the blastocyst protein coat e. the inner cell mass
________ were the first class of DNA sequence polymorphisms discovered in the human genome
A) SNPs B) Microsatellites C) VNTRs D) STRs E) RFLPs