Which statement best describes respiration in spiral-shaped bacteria?(1 point)

Question

Responses

Spiral-shaped bacteria are generally aerobic, but a subset of the group uses anaerobic respiration.
Spiral-shaped bacteria are generally aerobic, but a subset of the group uses anaerobic respiration.

Spiral-shaped bacteria are facultative anaerobes but can switch to aerobic respiration when needed.
Spiral-shaped bacteria are facultative anaerobes but can switch to aerobic respiration when needed.

Spiral-shaped bacteria only utilize aerobic respiration.
Spiral-shaped bacteria only utilize aerobic respiration.

Spiral-shaped bacteria only utilize anaerobic respiration.

Answer 1

The statement that best describes respiration in spiral-shaped bacteria is:

Spiral-shaped bacteria are generally aerobic, but a subset of the group uses anaerobic respiration.

This is because while many spiral-shaped bacteria (such as those in the genus Spirochaeta) are known to be aerobic, there are also species within this group that can utilize anaerobic respiration depending on their environment.

Answer 2

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)
Responses

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

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

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

Answer 3

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

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

Chemotrophs are organisms that obtain energy by the oxidation of electron donors in their environment. Many chemotrophic bacteria can utilize inorganic molecules. Testing growth in a sulfur solution could help ascertain if the bacterium can metabolize inorganic substances for energy, characteristic of chemotrophic organisms.

Answer 4

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 5

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 accurately reflects how bacteria reproduce, as they can undergo binary fission rapidly under optimal conditions, leading to exponential growth. The other statements either make incorrect generalizations about bacteria or do not accurately describe bacterial reproduction in various environments.

Answer 6

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; conjugation
sexual reproduction; conjugation

sexual reproduction; fission
sexual reproduction; fission

asexual reproduction; budding
asexual reproduction; budding

asexual reproduction; fragmentation

Answer 7

The type of reproduction your specimen underwent is:

asexual reproduction; fragmentation.

In this process, a section of the protist breaks off and develops into a new individual, which is characteristic of fragmentation. The other options are not applicable because they either describe sexual reproduction or different asexual processes that do not fit the scenario presented.

Answer 8

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 back and forth like a wagging tail 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.

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.

Answer 9

The correct response regarding the locomotion of the unknown protist with long lash-like appendages is:

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

This description is characteristic of flagella, which are whip-like structures that can move in a way similar to a tail, allowing the protist to swim actively.