Answer:
The answer is "A"
Explanation:
They cannot make their own food, they are heterotrophs
Answer:
Rough endoplasmic reticulum extends from the nucleus to the cell membrane and holds ribosome at its surface.
Explanation:
Endoplasmic reticulum is of 2 types rough endoplasmic reticulum and smooth endoplasmic reticulum.
Rough endoplasmic reticulum is named so because it contain ribosome on its surface as a result rough endoplasmic reticulum play a significant role during translation or protein biosynthesis.
Rough endoplasmic reticulum extends from the nucleus that"s why most of the proteins of rough endoplasmic reticulum is accessed by the nucleus and if any proteins of RER or rough endoplasmic reticulum is not properly folded or misfolded then specific signals are send from nucleus for the correct folding of proteins of RER.
Answer:
While skeletal muscles are arranged in regular, parallel bundles, cardiac muscle connects at branching, irregular angles, called intercalated discs. Striated muscle contracts and relaxes in short, intense bursts, whereas smooth muscle sustains longer or even near-permanent contractions.
Answer:
A. Glucose:
As lactose is absent will follow the glucose metabolism, so the lac repressor will hold tightly with the operator which leads to the prevention of transcription as RNA polymerase can not bind to promoter so no lactose metabolism.
B. lactose:
In the case or wild mutant lactose metabolism will occur as lactose is present, allolactose binds to the lac repressor thus the operator and promoter are free so transcription starts. The same result will be in all test except in the case of a mutant repressor.
C. glucose and lactose:
In this case, diauxic growth will occur. This growth takes place when two sugars are present in the media. The preferred sugar will be consumed first That is glucose. Then a lag phase will come which will be followed by the second sugar metabolism that is lactose. the given two cases :
Lactose will be metabolized first, as operator site mutation prevents repressor protein binding and thus will lead to the constitutive synthesis of lac operon in test B.
The same thing will happen, as in this case also, constitutive synthesis of lac operon will happen in test C.
Cultures grown in the presence of both glucose and lactose are metabolizing lactose. In the test (b) and (c) will be responsible due to constitutive synthesis of lac operon will happen.
