Some Echinoderms are capable of reproducing asexually using which of the following mechanisms?
a. budding
b. binary fission
c. fragmentation
d. conjugation
c. fragmentation
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Which of the following is the correct sequence of blood flow in birds and mammals?
A) left ventricle ? aorta ? lungs ? systemic circulation B) vena cava ? right atrium ? right ventricle ? pulmonary vein C) pulmonary vein ? left atrium ? left ventricle ? pulmonary circuit D) vena cava ? right atrium ? right ventricle ? pulmonary artery E) right atrium ? pulmonary artery ? left atrium ? ventricle
Which of the following is true of supercoiling?
A. The relaxed form of DNA is more stable and is therefore the preferred form in the cell. B. Most organisms maintain their DNA in a slightly overwound state in order to enhance strand separation during transcription and replication. C. Overwound DNA is in the B form so relaxed DNA has less turns than B-form DNA. D. Most organisms maintain their DNA in a slightly underwound state in order to compact their DNA. E. The relaxed form of DNA can only be maintained if the DNA is a closed circle.
Which of the following is associated with extracellular digestion caused by release of the lysosomes enzymes into the environment?
A) Tay-Sachs disease B) rheumatoid arthritis C) autophagy D) Hunter syndrome E) Hurler syndrome
How may an enhancer sequence facilitate transcription?
What will be an ideal response?