The germ layers are formed in which of the following stages?
a. cleavage
b. morula
c. gastrula
d. zygote
e. blastula
C
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The minimum inhibitory concentration (MIC) result recorded in antimicrobial testing can be defined as the:
a. lowest concentration of antimicrobial agent that should be used for optimal therapy. b. highest concentration of antimicrobial agent that should be used for optimal therapy. c. lowest antimicrobial agent concentration that completely inhibits visible bacterial growth. d. highest antimicrobial agent concentration that completely inhibits visible bacterial growth.
What is different between two versions of the same gene?
A. Their location. For example, one version might be at the end of one chromosome, while the other version is in the middle of another chromosome. B. The chromosome number they are on. For example, one version might be on chromosome 12, while the other one is on chromosome 3. C. The information they carry. For example, one version might carry the information for blue eye pigment, while the other carries the information for brown eye pigment. D. The cell they are in. For example, one might be in a liver cell, while the other is in a blood cell.
Heirloom plants are treasured for their flavorful produce and true-breeding progeny that allow gardeners to avoid repeatedly purchasing seed from agribusiness conglomerates. What special effort is required to save seed from heirloom biennials such as carrots?
A. Since carrots build up so much beta-carotene, they do not devote many resources to seed development. A yellow carrot variety will produce better seeds than a darker one. B. Since carrots produce large roots, they do not devote many resources to seed development. The roots must be trimmed before collecting seed. C. Biennials do not produce seed until the second year of growth. Although carrot roots are normally harvested after one season, they must be allowed to grow another year for seed collection. D. Since carrots are related to wild weeds, they are often cross-pollinated. The green top must be bagged to ensure self-pollination.
Answer the following questions true (T) or false (F)
1. The human embryo goes through a period of time with gill slits, an inheritance from an ancient ancestor. 2. The so-called modern synthesis of evolution brought together the evidence for evolution and the ideas of genetics. 3. In science, theories are well established and thus are not "theoretical" in the everyday usage of the word.