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natta225 [31]
3 years ago
15

Many mutations have been identified in the lac operon. A particular mutation prevents the repressor protein from binding to the

operator under all circumstances. Select all conditions which will lead to the operon being "on" with this mutation (For the purposes of these questions, either an extremely low level of expression or completely off are equivalent) MARK ALL THAT APPLY
Select one or more:
a. - glucose, + lactose Correct
b. - glucose, - lactose Correct
c. + glucose, - lactose
d. + glucose, + lactose
Biology
1 answer:
solong [7]3 years ago
8 0

Answer:

A and D

Explanation:

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What are characteristics of allosteric enzymes? They may have binding sites for regulatory molecules that are separate from acti
stepan [7]

Answer:

The characteristics of allosteric enzymes are listed below.

Explanation:

1 They may have binding sites for regulatory molecules that are separate from the active site.

2 They tend to have sigmoidal curve of V0 vs [S].

3 They undergo conformational change as a result of modulator binding

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4 years ago
The conversion of nitrates into atmospheric nitrogen is facilitated by microbes in a process called
Alina [70]
This process is called Denitrification. The process is undertaken by the denitrifying bacteria, whose action is converting nitrates in the soil to free atmospheric nitrogen and therefore, depleting soil fertility and reducing agricultural productivity. Examples of denitrifying bacteria are thiobacillus denitrificans, micrococcus denitrificans among others.
7 0
4 years ago
list 5 animals that live in the desert. Write a paragraph telling me how they can survive in this particular biome. What feature
NARA [144]

5 desert animals are camel, sand cat, desert tortoises, desert lizards and the great road runner.

<u>Explanation:</u>

  • Camel has several physiological and behavioral adaptations that help them survive the extreme conditions of the desert. They have flat feet to help them spread their weight in the sand.
  • They have thick eyelashes and closeable nostrils to prevent the entry of sand. They store fat on their humps that supplies energy during long journeys and has a long large intestine which increases water reabsorption.
  • Sand cat is similar to the domestic cat in basic appearance but has several adaptations enabling it to survive in the desert. Their paws are covered with thick and long hairs to protect the feet from the heat. They have thick fur that acts as an insulting surface during hot days and cold nights.  
  • Desert tortoises have excellent water storage capacity. Their bladders are larger than normal and can carry extra water. They have strong feet which helps them to dig holes in the sand and access rainwater.
  • Desert lizards can drink water through skin. They do it by a process called cutaneous water acquisition and it helps them to gather water obtained from rainfall, damp sand and pools.
  • Great roadrunner has peculiar adaptations. The digestive system of the bird retrieves water from the feces as it is in the excretory canal.  
4 0
4 years ago
You observe two populations of chimpanzees using sticks to dig termites out from nests for food. One population uses long sticks
icang [17]

Answer: B. The population using long sticks has mostly long sticks in its environment

Explanation:

Going back to the statement that reiterates the hypothesis after observations about the apes in the Introduction.

Reviewing the findings in this case, on the behavior of using sticks to dig seem to be the focus the experiment and choice length of the stick.

Making a judgment about whether or not the two finding has been supported is next step.

If there are equal numbers of short and long sticks in the environment of each population and the apes chooses one specific we can say their behavior is learned.

 If the chimpanzees using short sticks have made the the sticks short by breaking long sticks then we can say this behavior is learned.

When the Young chimpanzees in both populations start out using sticks of many different sizes we can see that these variables of learning is yet to be perfected.

When individuals in the population that don’t use the common stick length for that population catch fewer termites this reveals a randomness in the behavior of interest.

At this point we can say that if the population using long sticks has mostly long sticks in its environment then there is a biased objective in the study and this does not support the hypothesis that the choice of stick length is a learned behavior.

3 0
3 years ago
Why would minerals take millions of years to form? Explain please. If you do, you will be the brainliest with an extra 18 points
luda_lava [24]
Because types of chemicals in minerals need to form.
8 0
4 years ago
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