Organelles protect a cell by
A) sequestering biochemicals that could dismantle other cellular structures.
B) forming a thick outer barrier.
C) containing powerful enzymes that kill any bacteria that enter.
D) placing flag-like molecules on a cell's surface, which identify that cell as belonging to a particular person.
A) sequestering biochemicals that could dismantle other cellular structures.
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Which is true about prokaryotic (bacterial) RNA polymerase?
A. It is used during transcription. B. It does not require a primer. C. It has a detachable subunit, sigma factor, which recognizes the promoter. D. It reads the template in the 3'-5' direction. E. All of the choices are true.
Some dogs have erect ears; others have drooping
ears. Some dogs bark when following a scent; others are silent. Erect ears and barking are due to dominant alleles located on different chromosomes. A dog homozygous for both dominant traits is mated to a droopy-eared, silent follower. The expected phenotypic ratio in the F1 generation is a. 9:3:3:1. b. 100 percent of one phenotype. c. 1:1. d. 1:2:1. e. none of these.
The term specific activity differs from the term activity in that specific activity:
A) is measured only under optimal conditions. B) is the activity (enzyme units) in a milligram of protein. C) is the activity (enzyme units) of a specific protein. D) refers only to a purified protein. E) refers to proteins other than enzymes.
Lepidopterans (moths and butterflies) sometimes have specialized flying behaviors. Some moths have the ability to do sudden vertical drops when they detect bat sonar, to avoid being eaten. Other species use special flying techniques to attract a mate.When biologists talk about the "cause" of a behavior, they may be referring to two different things. The proximate cause is the sequence of physiological events that lead to the behavior in an individual. The ultimate cause is the adaptive benefit to the animal that allowed natural selection to sculpt the behavior over evolutionary time. Understanding both the proximate and ultimate basis of behavior is important, and different types of biologists may focus on each.A moth species is known for its unusual flying behavior, which includes
sudden vertical drops and horizontal zigzags. Not much is known about the cause of this behavior. What could you study to better understand the proximate basis of this behavior? (Check all that apply.)A) Brain structureB) Flying behavior in related speciesC) HormonesD) Mating behaviorE) PhysiologyF) PredationG) Sensory organsH) Wing muscle development What will be an ideal response?