Barnacles belong to which of the following groups of invertebrates?
a. crustaceans
b. mollusks
c. annelids
d. chelicerates
e. brachiopods
A; Barnacles are a type of crustacean. They have adapted to a life of filter feeding, and have become sessile and protected by a shell, but it does not resemble the shell of either filter-feeding mollusks (choice b) or brachiopods (choice e).
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Whether during mitosis or meiosis, sister chromatids are held together by proteins referred to as cohesins. Such molecules must _____
A) persist throughout the cell cycle B) be removed before meiosis can begin C) be removed before sister chromatids can separate D) reattach to chromosomes during G1 E) be intact for nuclear envelope re-formation
Aerobic degradation (pumping air or hydrogen peroxide into the contaminated site) is also known as ________
A) bioprocessing B) biostimulation C) bioventing D) composting E) landfarming
What is the function of the 5' cap in eukaryotic mRNA?
a. It provides an intron splicing signal. b. It helps with nuclear export. c. It provides attachment site for ribosomes. d. It stabilizes pre-mRNA.
Which of the following is mismatched>
A. Methanogens - convert CO2 and H2 gases into methane B. Extreme halophiles - adapted to salty habitats C. Hyperthermophile - adapted to high temp D. Psychrophiles - adapted to very low temp E. Thermoplasmas - adapted to frozen environment