Your teacher gives you an unknown bacterium to observe. Select the method that would help you determine whether the bacterium is a chemotroph.(1 point)

Question

Responses

growing the bacterium in a sulfur solution to see if it breaks the inorganic molecules down
growing the bacterium in a sulfur solution to see if it breaks the inorganic molecules down

growing the bacterium in an agar tube filled with protein to see if it breaks the organic molecules down
growing the bacterium in an agar tube filled with protein to see if it breaks the organic molecules down

exposing the bacterium to carbon dioxide to see if it fixes carbon
exposing the bacterium to carbon dioxide to see if it fixes carbon

exposing the bacterium to direct sunlight to see if it converts light to chemical energy
exposing the bacterium to direct sunlight to see if it converts light to chemical energy

Answer 1

To determine whether the unknown bacterium is a chemotroph, the most appropriate method would be:

growing the bacterium in a sulfur solution to see if it breaks the inorganic molecules down.

Chemotrophs obtain energy from the chemical bonds of inorganic or organic molecules, rather than from sunlight (as phototrophs do). By observing if the bacterium can break down inorganic molecules like sulfur, you would be able to determine if it is obtaining energy through chemotrophic means.

Answer 2

Which statement is most accurate regarding bacteria reproduction?(1 point)
Responses

When conditions are ideal, bacteria can reproduce by fission at very high rates in a short period of time.
When conditions are ideal, bacteria can reproduce by fission at very high rates in a short period of time.

When conditions are ideal, all bacteria reproduce by fission at the same rate over a similar period of time.
When conditions are ideal, all bacteria reproduce by fission at the same rate over a similar period of time.

When conditions are poor, all bacteria form endospores that activate when conditions improve.
When conditions are poor, all bacteria form endospores that activate when conditions improve.

When conditions are poor, bacteria can easily adjust and reproduce in the new environment.

Answer 3

The most accurate statement regarding bacteria reproduction is:

When conditions are ideal, bacteria can reproduce by fission at very high rates in a short period of time.

This statement correctly describes the asexual reproduction process of binary fission that occurs in bacteria, particularly under optimal conditions. The other statements are either too broad or inaccurate regarding bacterial behavior and reproduction.

Answer 4

You discover an unknown protist. A section breaks off from the main protist specimen, and this piece develops into an adult protist. Select the type of reproduction your specimen underwent and the name of this particular process.(1 point)
Responses

sexual reproduction; fission
sexual reproduction; fission

asexual reproduction; fragmentation
asexual reproduction; fragmentation

sexual reproduction; conjugation
sexual reproduction; conjugation

asexual reproduction; budding

Answer 5

The type of reproduction your specimen underwent and the name of this particular process is:

asexual reproduction; fragmentation.

In this case, the section that breaks off from the main protist develops into a new individual, which is characteristic of fragmentation, a form of asexual reproduction.

Answer 6

Your teacher gives you an unknown protist to classify that is currently inactive. The protist appears to have long lash-like appendages protruding from its cell surface. Which kind of locomotion can we expect from this protist?(1 point)
Responses

The appendages of this protist will move in a dragging motion that actively pulls the protist forward.
The appendages of this protist will move in a dragging motion that actively pulls the protist forward.

The appendages of this protist are not functional, and the protist moves passively via environmental forces.
The appendages of this protist are not functional, and the protist moves passively via environmental forces.

The appendages of this protist will move in a sweeping motion like oars to actively propel the protist forward.
The appendages of this protist will move in a sweeping motion like oars to actively propel the protist forward.

The appendages of this protist will move back and forth like a wagging tail to actively propel the protist forward.

Answer 7

Based on the description that the protist has long lash-like appendages, we can expect the following kind of locomotion from this protist:

The appendages of this protist will move back and forth like a wagging tail to actively propel the protist forward.

This description best fits the motion of flagella, which are long, whip-like structures that many protists utilize for locomotion.