By _____, researchers had established the location and arrangement of actin and myosin in _______
muscle.
a. 1924; striated
b. 1954; striated
c. 1924; smooth
d. 1994; smooth
e. 1904; smooth
B
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Many grasses are adapted for grazing. One such adaptation is the positioning of their meristems, which are high above the ground away from hungry herbivores
A. true B. false
Match the following items with the correct phrases.
_______1. A protein that plays a role in DNA replication. _______2. The end product of transcription. _______3. A protein that plays a role in transcription. _______4. The location of codons. _______5. The location of anticodons. _______6. An integral part of ribosomes, whether or not they are participating in protein synthesis. _______7. Produced in the nucleolus of eucaryotic cells. _______8. The molecule responsible for “activating” amino acids, thus enabling them to be added to the growing polypeptide chain. a. DNA polymerase b. RNA polymerase c. mRNA d. rRNA e. tRNA
Crossing over is one of the most important events in meiosis because
a. it produces new combinations of alleles on chromosomes. b. homologous chromosomes must be separated into different daughter cells. c. the number of chromosomes allotted to each daughter cell must be halved. d. homologous chromatids must be separated into different daughter cells. e. it decreases genetic diversity.
Which subatomic particles are always equal in neutral atoms?
a. electrons, neutrons and protons b. electrons and protons c. neutrons and protons d. electrons and neutrons e. nucleus and orbits