Hsc Model MCQ. Some Only 10 MCQ জীববিজ্ঞান প্রথম পত্র

The correct answer is "গুয়ানিন ও অ্যাডিনিন". This is because purine is a type of nitrogenous base found in DNA and RNA, and both guanine and adenine are purines. Therefore, both guanine and adenine can be classified as purine nucleotides.

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mRNA (messenger RNA) is the correct answer because it is the type of RNA that carries the genetic information from the DNA to the ribosomes in the cytoplasm, where it is used as a template for protein synthesis. The other options, Minor RNA, +RNA, and r-RNA, are not types of RNA and therefore do not contain the genetic code.

The correct answer is "প্রোটিন সংশ্লেষণ ও সংরক্ষণ করা" which means "protein synthesis and storage". This option correctly describes the role of the endoplasmic reticulum. The endoplasmic reticulum is responsible for the synthesis, folding, and modification of proteins. It also plays a role in storing and transporting proteins within the cell. Therefore, this option accurately represents the function of the endoplasmic reticulum.

The correct answer is "অ্যাডিনিন, সাইটোসিন, গুয়ানিন, ইউরাসইল". This is the correct order of the nucleotides found in RNA. Adenine pairs with uracil, and cytosine pairs with guanine.

The correct answer is "এক্রোসেন্ট্রিক" (Eccentric). The other options mentioned are "মেটাসেন্ট্রিক" (Metacentric), "সাব-মেটাসেন্ট্রিক" (Submetacentric), and "টেলোসেন্ট্রিক" (Telocentric). These terms are used in cytogenetics to describe the position of the centromere (the point on a chromosome where the two chromatids are attached) and the relative lengths of the arms of a chromosome. "এক্রোসেন্ট্রিক" refers to a chromosome where the centromere is located closer to one end, causing one arm to be shorter than the other.

RNA পলিমারেজ অথবা RNA polymerase (আরএনএ পলিমারেজ) একটি প্রোটিন যা ট্রান্সক্রিপশন প্রক্রিয়া নিয়ন্ত্রণ করে। এটি ডিএনএ মোলেকুল থেকে মেসেঞ্জার আরএনএ (মা-আরএনএ) মোলেকুল তৈরি করে। আরএনএ পলিমারেজ একটি প্রোটিন যা ট্রান্সক্রিপশন শুরু করে এবং ডিএনএ মোলেকুলের একটি অঞ্চলে বাইন্যারি নিউক্লিক এসিড বেস পেয়ে যায়। এরপর এই বাইন্যারি নিউক্লিক এসিড বেস দ্বারা মা-আরএনএ মোলেকুল তৈরি হয়।

The correct answer is "ই. কলি ওপরিণত লোহিত রক্তকণিকা" which means "Red blood cells do not have a nucleus." This is a factual statement about red blood cells. Red blood cells, also known as erythrocytes, are unique among cells in that they lack a nucleus. This absence of a nucleus allows red blood cells to have a biconcave shape and increases their surface area, which is important for their function of carrying oxygen to the body's tissues.

During the process of translation, mRNA is attached to ribosomes and amino acids are added to it with the help of tRNA molecules. This process occurs in the cytoplasm of the cell. The ribosome reads the mRNA sequence and uses it as a template to assemble the corresponding amino acids into a protein chain. The tRNA molecules bring the amino acids to the ribosome and ensure that they are added in the correct order according to the mRNA sequence. This process continues until the entire mRNA sequence has been translated into a protein.