Proterozoic era characterized by___

a) Origin of life

b) Fossils of blue green algae

c) Most invertebrate evolved

d) First gymnosperm

e) Abundance of marine algae

#Question id: 5689

#Unit 8. Inheritance Biology

What kind of aneuploidy gamete will be generated if meiotic nondisjuction in second division (n represent haploid number of chromosome )

#Question id: 582

#Unit 1. Molecules and their Interaction Relevant to Biology

When two different substrates react to form two different products, the rate constants for each separate substrate can be determined by

#Question id: 8852

#Unit 9. Diversity of Life Forms

The upper forelimbs of humans and bats have fairly similar skeletal structures, whereas the corresponding bones in whales have very different shapes and proportions. However, genetic data suggest that all three kinds of organisms diverged from a common ancestor at about the same time. Which of the following is the most likely explanation for these data?

#Question id: 5088

#Unit 5. Developmental Biology

 If gastrulation was blocked by an environmental toxin, then ________.

#Question id: 677

#Unit 1. Molecules and their Interaction Relevant to Biology

A helical wheel can be used to show