How can one distinguish between annuals, biennials, and perennials?
A. How tall they grow.
B. The number of flowers they produce.
C. The amount of root development.
D. The environment they grow in.
E. The time from seed germination to seed production.
E. The time from seed germination to seed production.
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An invertebrate, such as an insect, has innate immunity activity in its intestine that likely includes _____
A) a complement B) lysozyme C) mucus D) neutrophils E) dendritic cells
How do cells distinguish between estrogen and testosterone?
a. only male cells respond to testosterone and female cells respond to estrogen b. estrogen is hydrophilic and binds to surface receptors, while testosterone is hydrophobic and binds to internal receptors c. estrogen and testosterone have similar functional groups but different basic structures that are easily distinguished by their individual receptors d. estrogen and testosterone have the same basic structures, but different side chains that are easily distinguished by their individual receptors e. estrogen and testosterone bind to different carrier proteins, which help receptors distinguish between the two molecules
Which of the following statements is true about scientific theories?
1.A theory is a related set of hypotheses that form a broad-ranging explanation of many phenomena. 2.Theories can not be rejected. 3.Once established, theories can not change. 4.Scientists must not change their minds and replace theories in light of new evidence.
By what means do amoebas move?
A) Flagella B) Cilia C) Pseudopodia D) Amoebas do not move; they are anchored to the substrate.