Answer the following statements true (T) or false (F)
1. Genes that are expressed only when needed are called constitutive genes.
2. Polysaccharides, polypeptides, and nucleic acids are all examples of polymers.
3. During translation, amino acids are “activated” by attaching to an appropriate rRNA molecule.
4. The peptide bonds that hold amino acids together in protein molecules are examples of covalent bonds.
5. In double-stranded DNA molecules, the two strands are held together by hydrogen bonds.
1. FALSE
2. TRUE
3. FALSE
4. TRUE
5. TRUE
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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.
Which of the following characteristics does not apply to members of Protheria?
a. nocturnal b. insectivores c. aquatic d. placental mammals e. some weigh less than 5 g
A community in ecology is defined as ________
A) a group of organisms, all from the same species, and their surrounding environment B) organisms from multiple species interacting in the same place C) organisms from multiple species interacting in the same place, and their surrounding environment D) the global ecosystem
When a protein denatures, it ____
a. changes shape b. changes temperature c. changes pH d. binds more efficiently to its cofactor e. catalyzes reactions more efficiently