What molecule will allow some bacteria to be resistant to many penicillins?

A. Imipenem
B. Aztreonam
C. Synercid
D. Penicillinase
E. Clavulanic acid


Answer: D

Biology & Microbiology

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Answer the following statements true (T) or false (F)

1. Hagfish are craniates but are not vertebrates. 2. A hagfish is a not a fish. 3. Lampreys' main body support is the notochord, not a vertebral column. 4. Sharks have cartilaginous skeletons because bone-forming ability had not yet evolved in vertebrates when they originated. 5. The swim bladder is an organ in primitive fish from which the lungs of terrestrial vertebrates developed.

Biology & Microbiology

During metaphase of mitosis, how many telomeres are present in a cell in which 2n = 12?

A) 6 B) 12 C) 24 D) 48 E) 1200

Biology & Microbiology

Of these 4 genotypic classes of offspring, which arose from a parental gamete produced by the F1 females? (Select all that apply.)

In Drosophila, singed bristles (sn) and cut wings (ct) are both caused by recessive, X-linked alleles. The wild type alleles (sn+ and ct+) are responsible for straight bristles and intact wings, respectively. A female homozygous for sn and ct+ is crossed to a sn+ct male. The F1 flies are interbred. The F2 males are distributed as follows:



A) sn+ ct+
B) sn ct
C) sn+ ct
D) sn ct+

Biology & Microbiology

In humans, many types of cancers are associated with chromosomal mutations

Indicate whether the statement is true or false

Biology & Microbiology