These slender, or gracile, australopithecines are found later in the fossil record than A. afarensis
A) founder effect
B) Homo Habilis
C) Latin binomial
D) Australopithecus Africanus
E) convergent evolution
F) Ardipithecus ramidus
G) Neanderthals
H) chimpanzees
I) Homo erectus
J) astragalus
Answer: D) Australopithecus Africanus
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A decrease in the affinity of hemoglobin for oxygen caused by the binding of a hydrogen ion to hemoglobin is described by the
A) Henderson-Hasselbalch effect. B) Bohr effect. C) carbamino effect. D) respiratory quotient. E) Haldane effect.
The following experiment is hypothetical. Meselson and Stahl labeled DNA with the heavy N15 isotope of nitrogen, then allowed the DNA to go through one round of replication in the presence of the light N14 isotope. After analyzing the resulting double stranded DNA helices in a CsCl density gradient they observed two bands of DNA in the gradient. One band was found in a position expected for DNA that had only the light N14 isotope, while the other band was found at the heavy N15 position. These observations are consistent with which mode of DNA replication?
a. dispersive replication b. conservative replication c. dispersive or semi-conservative replication d. semi-conservative replication
Karyotyping
A) shows chromosomes as they appear in metaphase of meiosis II. B) can reveal alterations in chromosome number. C) examines points of crossing over. D) reveals the presence of cancerous genes.
During axonal projection, guidance cues bind to its receptors expressed on the plasma membrane of the (A)________, followed by organization of (B)___________.
a. (A) growth cone (B) cell body b. (A) synaptic terminal (B) cell body c. (A) growth cone (B) filopodia and lamellipodia d. (A) synaptic terminal (B) filopodia and lamellipodia