The fossil Sahelanthropus tchadensis from the Djurab Desert of Chad, dated at 6 to 7 million years ago, may be a hominin (i.e., share more recent common ancestry with humans than with any other ape because of ________
A) its relatively large brain
B) the shape of its thighbones
C) its sophisticated use of stone tools
D) fossil footprints showing bipedal locomotion
E) its relatively flat face
E
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The endosymbiosis that formed mitochondria likely occurred after eukaryotes developed photosynthetic capabilities
Indicate whether the statement is true or false.
The PCR technique doubles the amount of DNA in a sample in each cycle. If you started the PCR technique with two fragments of double-stranded DNA, calculate how many double-stranded DNA fragments you would you have after four cycles.
A. 16 B. 64 C. 32 D. 8
Which structure below is unique to organisms that harness solar energy to make sugar?
a. endoplasmic reticulum b. chloroplast c. plasma membrane d. chromosome e. nuclear envelope
Virions attach to a target host cell by means of (capsules/fimbriae/ligands).
Fill in the blank(s) with the appropriate word(s).